My take on a discrete shunt voltage regulator - Page 18

ikoflexer · 4th November 2009, 12:11 PM

A thin flat line, I like that! Well done!

ikoflexer · 4th November 2009, 12:14 PM

Quote:

Originally Posted by Salas

I test an SE Mosfet ccs'ed headphone buffer with shunt reg as we speak.

AKG 701, Grado SR60. 701 is a pig needs gain. SR60 happy.

Headphones can be extremely revealing. Are you going to let us know the results or should I ask privately?

Salas · 4th November 2009, 12:47 PM

Its nothing much. An IRF630 CCS'ed underneath at half 18V B+ and 260mA I bias. 0.75A Vbe V1 for both channels. 100VA Tx 2X4700 Elna //, soft recovery diode bridge. Dead silent even on sensitive cans, you need a led to know its on. Has triode type sound. Good tempo and a little upfront but grainless. V1 helped it a lot. Fleshes it out. I need to add a gain stage for insensitive headphones too on input 2. Anyone know a single psu opamp that is cheap, easily available and has smooth sonics?

ikoflexer · 4th November 2009, 12:54 PM

Why not a use a 2sk170 for gain? Simplistic

Salas · 4th November 2009, 12:56 PM

Clips early if simple common source. 2N5459 takes 2V p-p but at 6V p-p that CD is clips too. With available B+ that is.

Salas · 4th November 2009, 01:32 PM

Maybe I will use a normal +/- psu op amp from my drawer by creating a virtual ground, ...it will need yet another ac coupling on its input.

ikoflexer · 4th November 2009, 02:36 PM

I don't know, but I built two different phono stages based on opamps. Tried various opamps too. Then built your discrete phono and there was just no contest.

Salas · 4th November 2009, 02:46 PM

Its not something to keep. I was just helping a friend to finish it, because he stumbled. Its great for what it is, and I just want it to have an add on for his low efficiency cans too. Its concept is to be a buffer for efficient headphones. Practical little project, not for critical purposes.

stormsonic · 4th November 2009, 05:15 PM

Quote:

Originally Posted by Salas

Anyone know a single psu opamp that is cheap, easily available and has smooth sonics?

http://www.sg-acoustics.ch/analogue_...distortion.pdf

pick up your favorite...

HiFiNutNut · 4th November 2009, 08:47 PM

When will a C-Multiplier in front of the CCS-shunt be available?

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4th November 2009, 12:11 PM	#171
ikoflexer diyAudio Moderator Join Date: May 2008 Location: Toronto	A thin flat line, I like that! Well done!

4th November 2009, 12:47 PM	#173
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Its nothing much. An IRF630 CCS'ed underneath at half 18V B+ and 260mA I bias. 0.75A Vbe V1 for both channels. 100VA Tx 2X4700 Elna //, soft recovery diode bridge. Dead silent even on sensitive cans, you need a led to know its on. Has triode type sound. Good tempo and a little upfront but grainless. V1 helped it a lot. Fleshes it out. I need to add a gain stage for insensitive headphones too on input 2. Anyone know a single psu opamp that is cheap, easily available and has smooth sonics?

4th November 2009, 12:54 PM	#174
ikoflexer diyAudio Moderator Join Date: May 2008 Location: Toronto	Why not a use a 2sk170 for gain? Simplistic

4th November 2009, 12:56 PM	#175
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Clips early if simple common source. 2N5459 takes 2V p-p but at 6V p-p that CD is clips too. With available B+ that is.

4th November 2009, 01:32 PM	#176
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Maybe I will use a normal +/- psu op amp from my drawer by creating a virtual ground, ...it will need yet another ac coupling on its input.

4th November 2009, 02:36 PM	#177
ikoflexer diyAudio Moderator Join Date: May 2008 Location: Toronto	I don't know, but I built two different phono stages based on opamps. Tried various opamps too. Then built your discrete phono and there was just no contest.

4th November 2009, 02:46 PM	#178
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Its not something to keep. I was just helping a friend to finish it, because he stumbled. Its great for what it is, and I just want it to have an add on for his low efficiency cans too. Its concept is to be a buffer for efficient headphones. Practical little project, not for critical purposes.

4th November 2009, 08:47 PM	#180
HiFiNutNut diyAudio Member Join Date: May 2004 Location: Sydney	When will a C-Multiplier in front of the CCS-shunt be available?

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